ISL5571A

Features:

• Small Size/Surface-Mount Packaging
• Low Impulse Noise, Low EMI
• Clean, Bounce-Free Switching
• Line Break Switches
-0.5Ω Max r_ON Match
-28Ω Max r_ON
• Built-In Current Limiting, Thermal Shutdown and
Secondary Protection for the SLIC
• Optimized for Short Loop High REN Applications
• 3V/5V Logic-Capable I/O




Application

• Central Office • HFC
• PBX • FITL
•DLC • DAML




Pinout






Specifications

Maximum Supply Voltages
(V_DD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +7V
(V_BAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -19V to -100V
ESD Rating (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . 500V




Description

The ISL5571A is a solid state device designed to replace the electromechanical relay used on Subscriber Line Cards. The device contains two Line Break MOSFET switches, one Ring Return MOSFET switch and one Ring Access SCR switch. The ISL5571A is pin-for-pin compatible with the Lucent L7581AAE LCAS and Clare CPCL7581A Products. Improvements include: line break switches rON match (0.5 Max) higher dV/dt sensitivity (5000V/s), protection SCR hold current set to 110mA. The line break MOSFETs have very low on resistance (330V. The Ring Return MOSFET has a typical Ron of 50 and a blocking voltage >330V. The Ringing Access switch is implemented with a SCR device with a blocking voltage >480V. The SCR switch inherently offers low EMI connect and disconnect circuitry. All control I/Os use TTL thresholds making the device compatible with 3V logic. The ISL5571A also includes on-chip protection in the form of an over-voltage clamping circuit, current-limited MOSFET switches, and thermal shutdown circuitry. The over-voltage clamping circuit consists of a diode bridge and SCR.